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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package beatcmd

import (
	"context"
	"log/slog"
	"time"

	"github.com/KimMachineGun/automemlimit/memlimit"
)

func adjustMemlimit(ctx context.Context, d time.Duration, logger *slog.Logger) error {
	setMemLimit := func() {
		memlimit.SetGoMemLimitWithOpts(
			memlimit.WithProvider(
				memlimit.ApplyFallback(
					memlimit.FromCgroup,
					memlimit.FromSystem,
				),
			),
			memlimit.WithLogger(logger),
			memlimit.WithRefreshInterval(0),
			memlimit.WithRatio(0.9),
		)
	}

	setMemLimit()
	ticker := time.NewTicker(d)
	defer ticker.Stop()
	for {
		select {
		case <-ctx.Done():
			return ctx.Err()
		case <-ticker.C:
			setMemLimit()
		}
	}
}
